There is, or at least was, a plaque above a bench on a Main Street porch dedicated to Disney's business partner for Disneyland. He was, IIRC, an expert in hospitality.

The plaque read: 'A clean environment is a pleasure to the senses.'

As a kid, I remember being amused at the number of sweepers, dressed in striped shirts, pressed white pants and straw hats, whisking popcorn and straw wrappers off the walkways. In spite of tens of thousands of people, mostly kids, running and discarding, the park was always immaculate. It impresses me to this day not just that so much attention was given to cleanliness, but that Disney realized how much it mattered.